Input string was not in a correct format. ERROR

protected void Button1_Click(object sender, EventArgs e)
    {
        double Price = double.Parse(((Label)DataList1.Controls[0].FindControl("PriceLabel")).Text);
        string ProductName = ((Label)DataList1.Controls[0].FindControl("NameLabel")).Text;
        string ProductImageUrl = ((Label)DataList1.Controls[0].FindControl("ImageUrlLabel")).Text;
        int ProductID = int.Parse(Request.QueryString["ProductID"]);
        if (Profile.SCart == null)
        {
            Profile.SCart = new ShoppingCartExample.Cart();
        }
        Profile.SCart.Insert(ProductID, Price, 1, ProductName, ProductImageUrl);
        Server.Transfer("Products.aspx");
    }